JP3140162B2 - Heat transfer tube automatic cleaning device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for automatically cleaning the inside of a heat transfer tube by periodically passing a cleaning body through a heat transfer tube by a water flow.

[0002]

2. Description of the Related Art Conventionally, the following devices have been known as devices for cleaning the inside of a heat transfer tube of a heat exchanger. (1) A brush is inserted into the heat transfer tube, the direction of the water flow is reversed using a four-way switching valve, and the brush moves while rotating by the water flow, so that dirt attached to the inner wall of the heat transfer tube is automatically removed. apparatus. (2) Inject sponge balls into the cooling water of the refrigerator condenser, use the cooling water flow to push the balls into the heat transfer tubes, and always automatically clean the scale adhering to the heat transfer tube inner surface during operation. A device designed to do so.

[0003]

However, in the above method (2), a plurality of automatic switching valves and a partition valve in a ball vessel are required, and the structure becomes complicated, and a large space for installation is required. That is, there is a problem that an expensive and large-sized device is required. In addition, the method (1) requires a large four-way switching valve and has a problem that the chiller / heater must be stopped during cleaning. The present invention has been made in view of the above points,
An object of the present invention is to provide a heat transfer tube automatic cleaning device which can perform automatic cleaning with a simple configuration and can be incorporated into a device having a heat transfer tube such as a heat exchanger, and does not require a special peripheral space or an operation device. It is assumed that.

[0004]

In order to achieve the above-mentioned object, an automatic heat transfer tube cleaning apparatus according to the present invention, as shown in FIG. 1 and FIG. In a tube containing water, the specific gravity is 1
In the heat transfer tube cleaning device for cleaning using the larger cleaning body 30, a first water chamber 62 connected to a lower portion of the outlet header 14 of the heat transfer tube 12 and a lower portion of the first water chamber 62 are subjected to a pressure difference due to a water flow. A second water chamber 64 connected via a check valve 56 which opens and closes, and a third water chamber connected to a lower portion of the second water chamber 64 via a check valve 58 which opens and closes due to a pressure difference caused by a water flow. 66, a lower part of the third water chamber 66, a fourth water chamber 68 connected via a diaphragm 60 for opening and closing the check valve 58, and a second water chamber 64 below the check valve 56. Washing for connecting the water inlet 26 of the inlet header 18 with the water supply passage 42 provided with the switching valve 52 capable of opening and closing the check valves 56 and 58 , and for connecting the third water chamber 66 and the inlet header 18. Switching between the body transfer passage 44 and the water supply passage 42 Connecting 52 the upstream side and a fourth water chamber 68, the check valve by raising and lowering the diaphragm 60 58
Pipe 46 provided with a switching valve 54 capable of adjusting the opening and closing of the pipe
And the first and second water chambers 62 and 64 and the outlet header 14
A pressure equalizing pipe 50 for connecting the water outlet 22 to the vicinity thereof, a cleaning body recovering porous body 32 provided near the water outlet 22 of the outlet header 14, and provided near a connection between the water inlet 26 and the inlet header 18. Water inlet 26 and inlet header 18
An orifice plate 34 that creates a pressure difference between
It is characterized by consisting of. Further, in this apparatus, as shown in FIGS. 3 and 4, a water passage 72 for cleaning body recovery provided with a switching valve 74 for connecting the upstream side of the switching valve 52 of the water supply passage 42 and the outlet header 14. And a nozzle 76 connected to the water passage 72 for flowing water along the porous body 32 for cleaning body recovery.

[0005] As shown in Figs. 5 and 6, another apparatus of the present invention is used to wash the inside of the heat transfer tube 12 of the shell-and-tube heat exchanger 10 with a specific gravity greater than 1 while containing water. In the heat transfer tube cleaning device for cleaning using the cleaning body 30, a first water chamber 62 connected to a lower portion of the outlet header 14 of the heat transfer tube 12 and a lower portion of the first water chamber 62 are provided with a water flow.
That the second water chamber 64 connected via a check valve 56 for opening and closing by a pressure difference, connects the water inlet 26 of the lower check valve 56 in the second water chamber 64 inlet header 18, a check
A check valve 78 that connects the water supply passage 42 provided with a switching valve 52 capable of opening and closing the valves 56 and 78 and the second water chamber 64 and the inlet header 18 and that opens and closes due to a pressure difference caused by water flow.
Cleaning body transfer passage 80 having a first water chamber 62 and a second
A pressure equalizing pipe 50 connecting the water chamber 64 and the vicinity of the water outlet 22 of the outlet header 14; a porous body 32 for cleaning body recovery provided near the water outlet 22 of the outlet header 14;
Water inlet provided near the connection between the
An orifice plate 34 for generating a pressure difference between the port 26 and the inlet header 18 . In this apparatus, as shown in FIGS. 7 and 8, a water passage 72 for cleaning body collection provided with a switching valve 74 for connecting the upstream side of the switching valve 52 of the water supply passage 42 and the outlet header 14. And a nozzle 7 connected to the water passage 72 for flowing water along the porous body 32 for cleaning body recovery.
6 in some cases.

As the cleaning body 30, a sphere, a triangular body, a polygonal body, a spiral body, or the like having a specific gravity larger than 1 in a state containing water is used. When a sphere is used, it is particularly preferable to use a sponge ball, a rubber ball, or the like having a diameter slightly larger than the inner diameter of the heat transfer tube. Further, in order to facilitate the transfer of the washing body 30, the inside diameters of the washing body transfer passage 44 and the washing body transfer passage 80 are set to be larger than the inside diameter of the heat transfer tube 12.

[0007]

1 and 2, the switching valve 52, the switching valve 5
The check valve 56 and the check valve 58 are moved by the switching operation of No. 4, and a cleaning body such as a rubber ball (hereinafter, referred to as a rubber ball) in the second water chamber 64 and the third water chamber 66 is moved to the inlet header 18 by the water flow. When the rubber ball 30 is transferred and subsequently passes through the heat transfer tube (hereinafter, referred to as a tube) 12, the inside of the tube 12 is washed, and the washed rubber ball 30 passes through the outlet header 14 and the passage 48. It is collected in the first water chamber 62. 5 and 6, the switching operation of the switching valve 52 transfers the rubber ball 30 in the second water chamber 64 to the inlet header 18, and when the rubber ball 30 passes through the tube 12,
The rubber ball 30 having been subjected to the washing in the tube, and having been washed in the tube, is collected in the first water chamber 62 via the outlet header 14 and the passage 48. In FIGS. 3, 4, 7, and 8, the rubber ball attached to the porous body for ball collection 32 is moved downward by the water flow using the water flow at the water inlet 26 of the heat exchanger. The rubber balls are easily collected in the first water chamber 62 and the second water chamber 64. In each case, water was included.
The specific gravity of the cleaning body 30 such as a rubber ball in a crimped state is set to be slightly larger than 1. Repeat the above operation several times a day as needed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. However, the materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to them, unless otherwise specified. This is just an example. Embodiment 1 FIGS. 1 and 2 show an apparatus of this embodiment. 1, the water inlet 26 of the heat exchanger 10 and the inlet header 18
An orifice plate 34 is provided on the way to generate a pressure difference so that the water supply passage 42 on the upstream side of the orifice plate 34 passes through the second water chamber 64 and the third water chamber 66 to the washing body transfer passage 44 and the inlet header. After adjusting the pipeline resistance and the flow rate so that water flows to 18, a part of the cooling water flowing from the water inlet 26 of the heat exchanger is guided to the water supply passage 42 and the switching valve 52 is opened to cool the cooling water. Water flows into the second water chamber 64 and pushes up the check valve 56 to separate the first water chamber 62 and the second water chamber 64. The pressure of the first water chamber 62 is lower than that of the second water chamber 64, This pressure difference causes the check valve 56 to close. At this time, the switching valve 54 is closed and the check valve 58 is open. Then, the rubber balls 30 stored in the second water chamber 64 and the third water chamber 66 ride on the flow of water, pass through the transfer passage 44, move to the inlet header 18, are dispersed and enter the separate tubes 12. . When one rubber ball enters the tube 12, the flow is temporarily hindered.
The remaining rubber balls 30 flow into the other tubes 12 in which the flow is not obstructed one after another. The rubber balls 30 naturally disperse into one tube and enter one tube. . When the rubber ball 30 passes through the tube 12, the scale inside the tube is removed and taken out of the machine, so that the inner surface of the tube is automatically and continuously cleaned. The rubber ball 30 having passed through the tube accumulates in the first water chamber 62 via the outlet header 14 and the passage 48.
When all the rubber balls 30 in the second water chamber 64 and the third water chamber 66 are collected in the first water chamber 62, the cleaning cycle ends. Reference numeral 38 denotes an inlet of a fluid flowing outside the heat transfer tubes 12 of the heat exchanger 10, reference numeral 40 denotes an outlet of a fluid flowing outside the heat transfer tubes 12 similarly, and reference numeral 70 connects the third water chamber 66 and the fourth water chamber 68. When the switching valve 54 is closed and the check valve 58 is opened with the communication thin tube,
This is a pipe for releasing the pressure of the fourth water chamber 68. Then, when the switching valve 54 is opened and the check valve 58 is closed, the pressure of the water flowing in the fourth water chamber 68 is reduced, and the water flows in the third water chamber 66.

Next, as shown in FIG. 2, when the switching valve 52 is closed and the switching valve 54 is opened, the fourth water chamber 68 passes through the switching valve 54.
The diaphragm 60 is pushed up by the pressure (water pressure) of the water flowing to the valve, and the check valve 58 is closed. When the check valve 58 is closed,
As the water in the second water chamber 64 passes through the equalizing tube 50, the pressure is reduced. Therefore, the pressure difference between the first water chamber 62 and the second water chamber 64 disappears, and the check valve 56 is lowered and opened by its own weight. Rubber ball 30 accumulated in first water chamber 62
Falls into the second water chamber 64 and accumulates in the second water chamber 64. Next, until the switching valve 52 is opened and the switching valve 54 is closed,
0 remains in the second water chamber 64, and one cycle of the rubber ball washing cycle is completed. Next, when the switching valve 52 is opened and the switching valve 54 is closed, the rubber ball 30 passes through the third water chamber 66 from the second water chamber 64 and performs the same washing cycle as described above. In addition, the switching valve 5 may be stopped for operation stop or other reasons.
2. When both the switching valve 54 is closed, both the check valve 58 and the check valve 56 are opened, and the rubber ball 30 is accumulated in the third water chamber 66. The rubber ball 30 circulates through the heat exchanger and the cleaning device depending on one of the operating conditions of the cleaning cycle, the recovery cycle, and the stop, and then the rubber ball 30 is switched to the first water chamber 62, the second water chamber 64, or the third water chamber 66. Since the heat accumulates, there is no adverse effect on the performance of the heat exchanger and the like.

Embodiment 2 As shown in FIG. 3 and FIG.
In the device of the above, the porous body (filter) for washing body recovery
The cleaning body adhered to the nozzle 32 is moved by a water flow to collect the cleaning body more reliably. Heat exchanger water inlet 26
When a portion of the cooling water is introduced into the passage 72 and the switching valve 74 is opened, the cooling water flows out of the nozzle 76, and the flow causes the rubber ball attached to the ball recovery porous body 32 to be flushed downward, thereby causing the first water chamber to flow. 62, the ball is easily collected in the second water chamber 64. Other configurations and operations are the same as those shown in FIGS.

Embodiment 3 FIGS. 5 and 6 show an apparatus of this embodiment. 5, the water inlet 26 of the heat exchanger 10 and the inlet header 18
An orifice plate 34 is provided on the way to generate a pressure difference between the water supply passage 42 on the upstream side of the orifice plate 34, the second water chamber 64, a check valve 78, the washing body transfer passage 80 and the inlet header 18. After adjusting the pipe resistance and the flow rate so that the water flows, a part of the cooling water flowing from the water inlet 26 of the heat exchanger is supplied to the water supply passage 4.
When the switching valve 52 is opened, the cooling water is supplied to the second water chamber 64.
The first water chamber 62 and the second water chamber 64 are separated from each other, and the first water chamber 62 has a lower pressure than the second water chamber 64. Closes. At this time, the check valve 78 is opened by the force of flowing water. Therefore, the rubber balls 30 stored in the second water chamber 64 ride on the flow of water, pass through the transfer passage 80, move to the inlet header 18, are dispersed and enter the separate tubes 12. When one rubber ball enters the tube 12, the flow is temporarily hindered. Therefore, the remaining rubber balls 30 flow into the other tubes 12, which are not hindered one after another, by riding the flow of water. The rubber ball 30 naturally disperses into one tube. When the rubber ball 30 passes through the inside of the tube 12, the scale inside the tube is removed and taken out of the machine, so that the inner surface of the tube is automatically and continuously cleaned. The rubber ball 30 that has passed through the tube accumulates in the first water chamber 62 via the outlet header 14 and the passage 48. When all the rubber balls 30 in the second water chamber 64 are collected in the first water chamber 62, the cleaning cycle ends.

Next, when the switching valve 52 is closed as shown in FIG. 6, water in the second water chamber 64 passes through the pressure equalizing pipe 50 to reduce the pressure. Therefore, the pressure in the second water chamber 64 decreases from the pressure in the transfer passage 80 on the downstream side of the check valve 78, and the check valve 78 closes when water flows backward. Also,
For the same reason, the pressure difference between the first water chamber 62 and the second water chamber 64 disappears, and the check valve 56 is lowered and opened by its own weight.
The rubber balls 30 accumulated in the first water chamber 62 fall into the second water chamber 64 and accumulate in the second water chamber 64. Next, the switching valve 52 opens,
Until the check valve 56 closes, the rubber ball 30 remains in the second water chamber 6.
4 and one cycle of the rubber ball washing cycle is completed. Next, when the switching valve 52 is opened, the rubber ball 30 passes through the check valve 78 from the second water chamber 64 and performs the same washing cycle as described above. The rubber ball 30 circulates through the heat exchanger and the cleaning device depending on one of the operation conditions of the cleaning cycle, the recovery cycle, and the stop, and then the first water chamber 6
2. Since it accumulates in any of the second water chambers 64, there is no adverse effect on the performance of the heat exchanger and the like.

Embodiment 4 This embodiment is different from FIGS. 5 and 6 as shown in FIGS.
In the device of the above, the porous body (filter) for washing body recovery
The cleaning body adhered to 32 is moved by a water flow to be collected. When a part of the cooling water is guided from the water inlet 26 of the heat exchanger to the passage 72 and the switching valve 74 is opened, the nozzle 7
The cooling water flows out of 6, and the flow causes the rubber ball attached to the ball recovery porous body 32 to be pushed down, whereby the ball is easily recovered to the first water chamber 62 and the second water chamber 64. Other configurations and operations are the same as those shown in FIGS.

[0014]

As described above, the present invention has the following effects. (1) With a simple configuration, the inside of the heat transfer tube can be automatically cleaned without stopping the operation of the apparatus. (2) can be constructed compactly, often a small installation space, it is the this <br/> integrating Nde write easily set in the apparatus, the operation also results in easier der, moreover, Ru inexpensive der.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a heat transfer tube automatic cleaning apparatus according to the present invention, and is an explanatory view showing a state in which the inside of a tube is cleaned.

FIG. 2 is an explanatory diagram showing a state in which the state of FIG. 1 is switched to collect rubber balls.

FIG. 3 shows another embodiment of the apparatus of the present invention, and is an explanatory view showing a state in which rubber balls are being collected.

FIG. 4 is an explanatory diagram showing a state in which the inside of the tube is washed by switching the state of FIG. 3;

FIG. 5 is an explanatory view showing another embodiment of the apparatus of the present invention, showing a state in which the inside of the tube is being washed.

FIG. 6 is an explanatory diagram showing a state in which the state of FIG. 5 is switched to collect a rubber ball.

FIG. 7 is an explanatory view showing a still further embodiment of the device of the present invention, in a state where rubber balls are collected.

FIG. 8 is an explanatory diagram showing a state in which the inside of the tube is being washed by switching the state of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Heat exchanger 12 Heat transfer tube 14 Outlet header 18 Inlet header 22 Water outlet 26 Water inlet 30 Washing body 32 Porous body for washing body recovery 34 Orifice plate 38 Fluid inlet 40 Fluid outlet 42 Water supply passage 44 Washing body transfer passage 46 Operation piping 48 Passage 50 Equalizing pipe 52 Switching valve 54 Switching valve 56 Check valve 58 Check valve 62 First water chamber 64 Second water chamber 66 Third water chamber 68 Fourth water chamber 70 Communication thin tube 72 Washing body recovery Water passage 74 switching valve 76 nozzle 78 check valve 80 washing body transfer passage

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-183797 (JP, A) JP-A-4-45396 (JP, A) JP-A-58-184500 (JP, A) JP-A-57-184 14195 (JP, A) Japanese Utility Model 63-197996 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F28G 1/12

Claims (4)

(57) [Claims] 1. A shell and tube heat exchanger (1)
0) The specific gravity of the heat transfer tube (12) containing water in the heat transfer tube (12)
A heat transfer tube cleaning device for cleaning using a cleaning body (30) having a size greater than 1; a first water chamber (62) connected to a lower portion of an outlet header (14) of a heat transfer tube (12); at the bottom of the (62), the pressure difference caused by water flow
A second water chamber (64) connected via a check valve (56) that opens and closes, and a lower part of the second water chamber (64) is provided with a pressure difference due to a water flow.
A third water chamber (66) connected via a check valve (58) that opens and closes, and a diaphragm (60) for opening and closing the check valve (58) below the third water chamber (66). ) and connected via the fourth water chamber (68), connects the water inlet (26) of the lower inlet header of the check valve in the second water chamber (64) (56) (18), opposite Stop
A switching valve (5 ) capable of opening and closing the valves (56) and (58)
2) a water supply passage (42), a washing body transfer passage (44) connecting the third water chamber (66) and the inlet header (18), and a switching valve (52) for the water supply passage (42). ) The diaphragm (60) connecting the upstream side and the fourth water chamber (68) is raised and lowered.
The operation pipe (46) provided with the switching valve (54) capable of opening and closing the check valve (58) by opening and closing , the first water chamber (62) and the second water chamber (64), and the outlet header ( 14) A pressure equalizing pipe (5) connecting the vicinity of the water outlet (22)
0), a porous body (32) for cleaning body recovery provided near the water outlet (22) of the outlet header (14), and provided near the connection between the water inlet (26) and the inlet header (18). Water inlet (26) and inlet header (18)
Orifice plate that creates a pressure difference between
4) An automatic heat transfer tube cleaning device comprising: 2. A washing water collecting water passage (72) having a switching valve (74) for connecting an upstream side of the switching valve (52) of the water supply passage (42) and the outlet header (14). The nozzle according to claim 1, further comprising: a nozzle (76) connected to the water passage (72) for flowing water along the porous body (32) for recovering the cleaning body. Heat tube automatic cleaning device. 3. A shell and tube heat exchanger (1).
0) The specific gravity of the heat transfer tube (12) containing water in the heat transfer tube (12)
A heat transfer tube cleaning device for cleaning using a cleaning body (30) having a size greater than 1; a first water chamber (62) connected to a lower portion of an outlet header (14) of a heat transfer tube (12); at the bottom of the (62), the pressure difference caused by water flow
A second water chamber (64) connected via a check valve (56) that opens and closes; a water inlet (2) below the check valve (56) and the inlet header (18) in the second water chamber (64); 26) Connect with, check
A switching valve (5 ) capable of opening and closing the valves (56) and (78)
Washing body transfer provided with a check valve (78) connecting the water supply passage (42) provided with 2), the second water chamber (64) and the inlet header (18), and opening and closing by a pressure difference due to water flow. A pressure equalizing pipe (5) connecting the passage (80), the first water chamber (62), the second water chamber (64), and the vicinity of the water outlet (22) of the outlet header (14).
0), a porous body (32) for cleaning body recovery provided near the water outlet (22) of the outlet header (14), and provided near the connection between the water inlet (26) and the inlet header (18). Water inlet (26) and inlet header (18)
Orifice plate that creates a pressure difference between
4) An automatic heat transfer tube cleaning device comprising: 4. A washing water collecting water passage (72) having a switching valve (74) for connecting the upstream side of the switching valve (52) of the water supply passage (42) to the outlet header (14). The nozzle according to claim 3, further comprising: a nozzle (76) connected to the water passage (72) for flowing water along the porous body (32) for recovering the washing body. Heat tube automatic cleaning device.